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Johnson appeared Sunday on "UPFRONT with Mike Gousha," produced in partnership with Wispolitics.com.

The most recent Marquette University Law School poll showed Feingold leading Johnson by six points among likely voters.

"Do you feel you're the underdog?" Gousha asked.

"I think I am. But the race is closer," Johnson said. "Let's face it. We've been outresourced. Mr. 'Campaign Finance Reform' set up his two PACS, raised $10 million, does that seem like a familiar figure? And basically spent that money on himself."

Johnson said some of the polls were taken before his most recent positive television advertising came out.

"I think when Wisconsinites really focus on the race, when they see that I've actually accomplished something, not only have I traveled tirelessly around the state listening to Wisconsinites, I've taken action, and I've put myself in a position to actually accomplish things," Johnson said.

Johnson cited his chairmanship of the Senate's Homeland Security Committee, saying that it's "pretty unusual" for a first-term senator to be a chairman of a full, standing committee.

"Sen. Feingold never was one," Johnson said. "And that chairmanship is key, because you can really accomplish things from that position."

Johnson also said his accomplishments include working with other senators to clear the way for a new lift bridge between Wisconsin and Stillwater, Minnesota, and expanding broadband access in northwestern Wisconsin.

Feingold, he said, is a "career politician."

"Thirty four years in politics. Literally, what did he ever accomplish?" Johnson said. "Sen. Feingold has one high-profile failure, campaign finance reform. A lot of it ruled unconstitutional. I've got dozens of accomplishments."

Johnson also discussed trade, his "Right to Try" bill, and the bill that would allow 9-11 victims to sue Saudi Arabia.

Also on the program, state Rep. Chris Taylor, D-Madison, said the documents leaked from the second John Doe investigation suggest Gov. Scott Walker, his campaign committee and others may have violated campaign finance laws.

Taylor and other Democratic state lawmakers have asked Dane County District Attorney Ismael Ozanne to investigate.

"These are new allegations, these are new facts, these are new potential criminal violations that have never been considered by a court, that have never been raised," Taylor said.

"We think it's imperative that the district attorney investigate these potential crimes, they are very serious, these are felonies and frankly we don't have any other tools available to us for political investigations because Republicans in the legislature and Gov. Walker have taken them away. So this is really one of our only options that we have left," she said.

A Walker campaign spokesman called the Democrats' complaint frivolous.